Improvement in rotary engines



S. P. UCHILTBEEL Rotary Engines.

Pa tented June 10, 1873.

UNITED STATES PATENT OFFICE.

SAMUEL I. OOHILTREE, OF ORANGE, INDIANA, ASSIGNOR OF ONE-HALF OF HISRIGHT TO GEORGE H. PUNTENNEY.

IMPROVEMENT IN ROTARY ENGINES.

Specifi ation forming part of Letters Patent No. 139,807, dated J une10, 1873; application filed April 23, 1673.

To all whom it may concern:

Be it known that I, SAMUEL P. OGHILTREE, of Orange, county of Fayetteand State of Indiana, have invented certain Improvements in ltotaryEngines, of which the following is a specification:

My improvement consists in the arrangement of two cylinders, connectedtogether by a shatt, on which is placed another cylinder having abelt-surface at its center and a cam at each side of the belt-Wheel.These cams are made in such a way that the slide-valves are worked eachindependent of the other, and. one has always apositive pressure againstit until the other is in its position, thus giving a constant pressureagainst the piston at all times.

' By my construction of parts I have a movable valve for each cylinder,which moves back to let the piston pass, and then moves forward to forman abutment for the steam to press against, and thereby always have apressure of steam against one valve or sliding abutment until the othervalve is in position to receive the pressure.

Figure 1 represents a side elevation of a double rotary engine,partially in section, embodying my improvement. Fig. 2 is an elevationof one end of the same.

A A are the cylinders, mounted upon legs 0 U, which are secured to thebed X. B B represent the heads of the cylinders. G is the main shaft,that passes through the two cylinders, and has a band-wheel or drum, N,at its center. On each side of the band-wheel N is another drum, M M, ineach of which is a cam-groove, O O, arranged in such a manner that whenthe wheel N revolves the cam moves the valveabutments H and H forwardand back alternately, but never moves one back until the other is inposition to work. Each of these abutments has a downwardprojecting pin,L, which fits into the camgrooves O O to cause the desired movement.

. The valve abutments or slides H and H slide in the steam chests It farenough to let the pistons E and E pass, and then move forward far enoughto form an abutment in the cylinder for steam to press against. In eachof these valve'slides H and H is a hole,J and J, bored through from thetop of the valve and out at the side of the valve,'when the valge is inthe position, as shown in Fig. 1, at

It will be seen that the opening in the valve H, at the upper side, isdirectly opposite the entrance of the steam through the pipe P, and theother end of the hole J of the valve H is just inside of the cylinder,as shown by the line any. This gives steam instantly to this side of thepiston and against the valve, causing it to revolve; and while in thisposition the piston in the opposite cylinder A passes the valve H. Whenthis valve moves forward, by means of the cam O, and as the holeJ inthis valve comes opposite the steampipe 1 it takes steam, and the othervalve, H, moves back to allowthe piston E to pass. By this arrangementwe always have a constant pressure to perform the work against the twopistons E and E the same as a reciprocating engine, and the arrangementof the holes J and J in the valves makes a perfect cut-off to the steamuntil they are in theproper positition to admit steam again.

I claim- The combination of the cylinders AA with wheels I) and pistonsE E, the shaft G with central drum N, and side drums M M havingcam-grooves O O, the steanrchests It It, and

the sliding ahutments H H with pins L L, all the parts constructed andarranged substantially as and for the purposes herein set forth. I

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

SAMUEL P. OcHILTREE.

' Witnesses: I

S. U. FRINK, E. O. FRINK.

